Dynamo electric machine



Aug. 4, 1931. H. P. LINDERS DYNAMO ELECTRIC MACHINE Filed Feb. 20, 1930 q L s ////////IIII/. Inventor g2 BY Pumas Aug. 4, 1931 I 1,816,859

UNITED STATES PATENT OFFICE HARRY I'. Lnmms, 01 ST. LOUIS, MISSOURI, .ASSIG-NOR TO WAGNER ELECTRIC COR- PORATIQN, OF ST. LOUIS, MISSOURI, A CORPORATION OF DELAWARE mmmo ELECTRIC macnmn Application filed February 201 1930. Serial No. 429,864.

' My invention relates to an improvement After the parts are assembled as described, in the construction of the stationary part the ends of the frame may be machined to of a dynamo electric machine and the methform a circumferential shoulder, as shown, d of making the same. a t has heretofore. to receive the ends of the end plates 6, which i 5 been proposed to form the frame of these latter may be held in position by through 55 machines of a circular tube made by rolling bolts 7 passing through the channels formed a sheet of steel into circular form and weldbetween the stator iron and the frame by the ing the edges together, and in order to form supporting projections 2. These channels ventilating channels between the exterior constitute passages for circulating air over 10 of the laminae of the stator member and the the surface of the stator member. 60 I frame, separate metal spacing strips have Frame supports are formed by means of been employed which have been secured in two angle irons 8 which have arcuate devarying manner to the inner wall of the pressions in one web of the shape to conframe to form spaced supports for the form to the frame to which they are welded.

stator. My invention constitutesan im- It will be apparent that by my invention 65 provement in this practice which bot-h rethe frame structure for a stationary memduces the ,cost of construction and provides ber having the desired ventilating channels a one-piece rigid frame. can be formed more cheaply than according In the accompanying drawings Figure 1 to prior practices; that all problems of is an end view'of the stationary member of properly securing the stator member sup- 7 a motor constructed in accordance with my ports to the frame are avoided; and that a invention (the field winding being omitted); rigid one piece sheet metal frame is proand Figure 2 is a cross-sectional view along duced WhlCh has all of the deslrable c arthe line 2 of Figure 1. acteristi-cs of a cast frame.

To form the stationary part of a dynamo Having fully descrlbed my invention, what electric machine as shown, a sheet of steel I Clalm 88 n n qs to S c re by L tis bent into circular form and the edges IS P tent 0f the Unlted States 1s: welded together, making a tube 1 of larger 1- Th m h d f man a urlng a s adiameter than the finisheddiameter of the unwa y 'ln mber for a dynamo electr c maframe. Circumferentially spaced longituchine whlch comprises forming a laminated dinally extending portions ofthe frame are stator field member of cyllndrical periphery, then pressed inwardl to form projections 2 forming a sheet metal tubular frame memsintermediate the" en s of the frame, which ber, of larger diameter than the desired operation reduces-the diameter of the frame diameter of the finished frame,press1n por- 3:; tube to the desired size.' The inner faces of tions of the wall of the tube inwar ly to the projections are then machined to cause form spaced supports for the stator memthem to constitute portions of a single cylinber, and machining the faces of said supdrical surface and the wiring conduit 'eleports to cause them to form a press fit w th ment 3 is inserted through an opening in the stator member when the latter s ineo the frame. The stator laminae are secured serted 1n the frame. o I

' ther in unit form 1 by means of line' 2. The method of manufacturing a stawelds 4 longitudinally extending .in the tlonary member for a dynamo electric maknown manner, and then the-exterior of the chine which comprises forming a laminated unit is machined to cylindrical form and to stator field member of cyhndncal periphery,

45 make a press fitwith the supporting rojecforming a sheet metal tubular frame me'mtions 2 of the frame when inserted t erein. ber, pressmg portions of the wall of the To secure the stator member in the frame tube mwardlyto form spaced supports for one or more dowel pins 5 are rovided which the stator member, machining the faces of extend through holes in the rame and into said supportsto cause them to form a press F0 holes drilled in the lamina bod fit with the stator member when the latter wt 7 is inserted in the frame, and welding sup ports to spaced portions of the exterior of the frame.

3. A dynamo electric machine comprising a stator member and a one-piece sheet metal casing member surrounding the peripheral portion of the stator member and provided with integral inwardly depressed stator supporting portions.

l. A dynamo electric machine comprising a cylindrical stator member and a one-piece sheet metal casing member surrounding the peripheral portion of the stator member and provided with integral inwardly depressed stator supporting portions having curved inner surfaces conforming to and bearing on the periphery of the stator.

5. A dynamo electric machine comprising a stator member and a one-piece sheet metal casing member surrounding the peripheral portion of the stator member and provided with integral inwardly depressed stator supporting portions, and a pin engaging the casing and the stator to prevent their relatire longitudinal movement.

(3. A dynamo electric machine comprising a cylindrical stator member, and a cylindrical one-piece sheet metal casing member of larger diameter than the stator and surrounding the peripheral portion thereof, said casing being provided with integral peripherally spaced inwardly depressed portions supporting the stator and spacing it from the casing.

7. A dynamo electric machine comprising a stator member and a one-piece tubular sheet metal casing member surrounding the peripheral portion of the stator and pro vided with integral peripherally spaced portions engaging the stator to support the same and with other integral portions spaced from the stator to form Ventilating channels.

In testimony whereof, I hereunto afiix my signature, this 14th day of February, 1930.

HARRY P. LINDERS. 

